When at last the whole of Europe was mobilised against Napoleon and he was finally defeated, the whole face of Europe was changed, and the former order of things could not possibly be restored. It was the task of the European Congress of Vienna in 1814 and 1815 to create a new order and a fresh balance of power. This new order comprised chiefly the following arrangements:--The Prussian and the Austrian monarchies were re-established, as was also the Germanic Confederation, which consisted henceforth of thirty-nine member States. A kingdom of the Netherlands was created out of Holland and Belgium. Norway and Sweden became a Real Union. The old dynasties were restored in Spain, in Sardinia, in Tuscany, and in Modena, as was also the Pope in Rome. To the nineteen cantons of the Swiss Confederation were added those of Geneva, Valais, and Neuchâtel, and this Confederation was neutralised for all the future.
But the Vienna Congress did not only establish a new political order in Europe, it also settled some questions of International Law. Thus, free navigation was agreed to on so-called international rivers, which are rivers navigable from the Open Sea and running through the land of different States. It was further arranged that henceforth diplomatic agents should be divided into three classes (Ambassadors, Ministers, Chargés d'Affaires). Lastly, a universal prohibition of the trade in negro slaves was agreed upon.
§ 47. The period after the Vienna Congress begins with the so-called Holy Alliance. Already on September 26, 1815, before the second Peace of Paris, the Emperors of Russia and Austria and the King of Prussia called this alliance into existence, the object of which was to make it a duty upon its members to apply the principles of Christian morality in the administration of the home affairs of their States as well as in the conduct of their international relations. After the Vienna Congress the sovereigns of almost all the European States had joined that alliance with the exception of England. George IV., at that time prince-regent only, did not join, because the Holy Alliance was an alliance not of the States, but of sovereigns, and therefore was concluded without the signatures of the respective responsible Ministers, whereas according to the English Constitution the signature of such a responsible Minister would have been necessary.